1620670811738 has 32 divisors (see below), whose sum is σ = 2673555406848. Its totient is φ = 730685718000.

The previous prime is 1620670811719. The next prime is 1620670811741. The reversal of 1620670811738 is 8371180760261.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11460563 + ... + 11601113.

It is an arithmetic number, because the mean of its divisors is an integer number (83548606464).

Almost surely, 2^{1620670811738} is an apocalyptic number.

1620670811738 is a deficient number, since it is larger than the sum of its proper divisors (1052884595110).

1620670811738 is a wasteful number, since it uses less digits than its factorization.

1620670811738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144818.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 1620670811738 in words is "one trillion, six hundred twenty billion, six hundred seventy million, eight hundred eleven thousand, seven hundred thirty-eight".